package com.dlna.client.util;

import com.daimajia.androidanimations.library.Techniques;
import com.daimajia.androidanimations.library.YoYo;
import com.dlna.client.R;

import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.LinearLayout;

/**
 * User: qii
 * Date: 13-9-14
 */
public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
    private static float MIN_SCALE = 0.85f;
    private static float MIN_ALPHA = 0.5f;

    @SuppressLint("NewApi")
	public void transformPage(View view, float position) {
        int pageWidth = view.getWidth();
        int pageHeight = view.getHeight();

        if (position < -1) { // [-Infinity,-1)
            // This page is way off-screen to the left.
            view.setAlpha(0);

        } else if (position <= 1) { // [-1,1]
            // Modify the default slide transition to shrink the page as well
            float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
            float vertMargin = pageHeight * (1 - scaleFactor) / 2;
            float horzMargin = pageWidth * (1 - scaleFactor) / 2;
            if (position < 0) {
                view.setTranslationX(horzMargin - vertMargin / 2);
            } else {
                view.setTranslationX(-horzMargin + vertMargin / 2);
            }

            // Scale the page down (between MIN_SCALE and 1)
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);

            // Fade the page relative to its size.
            view.setAlpha(MIN_ALPHA +
                    (scaleFactor - MIN_SCALE) /
                            (1 - MIN_SCALE) * (1 - MIN_ALPHA));
            
            

        } else { // (1,+Infinity]
            // This page is way off-screen to the right.
            view.setAlpha(0);
        }
        
        if(position == 0 && (Boolean)view.getTag()){
        	LinearLayout textLayout = (LinearLayout)view.findViewById(R.id.textLayout);
        	textLayout.setVisibility(View.VISIBLE);
        	YoYo.with(Techniques.FadeInDown)
		    .duration(700)
		    .playOn(textLayout);
        }
        
    }
}